Montero LS 4WD V6-2972cc 3.0L SOHC 12 Valve (1994)
Checking Actuator Operation (Off the Car)
1. Remove the throttle body.
2. Remove the stepper motor.
3. Connect the special tool (test harness) to the idle air control motor connector.
4. Connect the positive terminal of a power source (approx. 6 V) to the white clip or the green clip.
5. While holding the idle air control motor as shown in the illustration, connect the negative power source terminal to each clip in the sequence
described below, and check whether or not there is vibration (a feeling of very slight shaking of the stepper motor) as a result of activation of the
stepper motor.
1. Connect the negative power source terminal to the red and black clips.
2. Connect the negative power source terminal to the blue and black clips.
3. Connect the negative power source terminal to the blue and yellow clips.
4. Connect the negative power source terminal to the red and yellow clips.
5. Connect the negative power source terminal to the red and black clips.
6. Repeat the test in the reverse (5-1) sequence.
6. If vibration is felt as a result of this test, the stepper motor can be considered to be normal.
TROUBLESHOOTING HINTS
If the number of stepper motor steps increases to 100-120 steps or decreases to 0 step, the cause is probably a malfunction of the stepper motor or
damaged or disconnected wiring of the harness.
If the number of stepper motor steps is outside the standard value even through the results of the checking of the harness of the idle air control
motor and of the component itself indicate no abnormal condition, the cause is probably one of the following:
-
Incorrect adjustment of the standard idling speed
-
Deposits adhering to the throttle valve
-
Air drawn into the intake manifold from a leaking gasket, etc.
-
Incomplete combustion inside a cylinder (Malfunction of spark plugs, ignition coil, injectors, compression pressure, etc.)
NOTE: When the vehicle is new [driven approximately 500 km (300 miles) or less] the number of steps may be about 30 steps greater than the
standard value indicated above.
